Andreas Mandelis (born 22 June 1952) is a professor and researcher at the department of Mechanical and Industrial Engineering at the University of Toronto and director of the Center for Advanced Diffusion-Wave and Photoacoustic Technologies (CADIPT). He is an internationally recognized expert in thermophotonics. His research encompasses the non-destructive evaluation of materials with industrial and biomedical applications. He is considered a pioneer in the fields of diffusion wave, photothermal and photoacoustic sciences and related technologies. He is the inventor of a photothermal imaging radar which can detect tooth decay at an early stage.